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Add internal helper function to load prevalidated key material

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Signed-off-by: Steven Cooreman <steven.cooreman@silabs.com>
This commit is contained in:
Steven Cooreman 2020-10-13 20:27:40 +02:00
parent 0452476eac
commit f7cebd4a2b
2 changed files with 38 additions and 7 deletions
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24
library/psa_crypto.c
View File

@ -969,6 +969,19 @@ static psa_status_t psa_allocate_buffer_to_slot( psa_key_slot_t *slot,
return( PSA_SUCCESS ); return( PSA_SUCCESS );
} }
psa_status_t psa_copy_key_material_into_slot( psa_key_slot_t *slot,
const uint8_t* data,
size_t data_length )
{
psa_status_t status = psa_allocate_buffer_to_slot( slot,
data_length );
if( status != PSA_SUCCESS )
return( status );
memcpy( slot->data.key.data, data, data_length );
return( PSA_SUCCESS );
}
/** Import key data into a slot. `slot->attr.type` must have been set /** Import key data into a slot. `slot->attr.type` must have been set
* previously. This function assumes that the slot does not contain * previously. This function assumes that the slot does not contain
* any key material yet. On failure, the slot content is unchanged. */ * any key material yet. On failure, the slot content is unchanged. */
@ -1001,13 +1014,10 @@ psa_status_t psa_import_key_into_slot( psa_key_slot_t *slot,
return( status ); return( status );
/* Allocate memory for the key */ /* Allocate memory for the key */
status = psa_allocate_buffer_to_slot( slot, data_length ); status = psa_copy_key_material_into_slot( slot, data, data_length );
if( status != PSA_SUCCESS ) if( status != PSA_SUCCESS )
return( status ); return( status );
/* copy key into allocated buffer */
memcpy( slot->data.key.data, data, data_length );
/* Write the actual key size to the slot. /* Write the actual key size to the slot.
* psa_start_key_creation() wrote the size declared by the * psa_start_key_creation() wrote the size declared by the
* caller, which may be 0 (meaning unspecified) or wrong. */ * caller, which may be 0 (meaning unspecified) or wrong. */
@ -2180,12 +2190,12 @@ exit:
static psa_status_t psa_copy_key_material( const psa_key_slot_t *source, static psa_status_t psa_copy_key_material( const psa_key_slot_t *source,
psa_key_slot_t *target ) psa_key_slot_t *target )
{ {
psa_status_t status = psa_allocate_buffer_to_slot( target, psa_status_t status = psa_copy_key_material_into_slot( target,
source->data.key.bytes ); source->data.key.data,
source->data.key.bytes );
if( status != PSA_SUCCESS ) if( status != PSA_SUCCESS )
return( status ); return( status );
memcpy( target->data.key.data, source->data.key.data, source->data.key.bytes );
target->attr.type = source->attr.type; target->attr.type = source->attr.type;
target->attr.bits = source->attr.bits; target->attr.bits = source->attr.bits;

21
library/psa_crypto_core.h
View File

@ -161,6 +161,27 @@ psa_status_t psa_import_key_into_slot( psa_key_slot_t *slot,
const uint8_t *data, const uint8_t *data,
size_t data_length ); size_t data_length );
/** Copy key data (in export format) into an empty key slot.
*
* This function assumes that the slot does not contain
* any key material yet. On failure, the slot content is unchanged.
*
* \param[in,out] slot Key slot to copy the key into.
* \param[in] data Buffer containing the key material.
* \param data_length Size of the key buffer.
*
* \retval #PSA_SUCCESS
* The key has been copied successfully.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* Not enough memory was available for allocation of the
* copy buffer.
* \retval #PSA_ERROR_ALREADY_EXISTS
* There was other key material already present in the slot.
*/
psa_status_t psa_copy_key_material_into_slot( psa_key_slot_t *slot,
const uint8_t *data,
size_t data_length );
/** Convert an mbed TLS error code to a PSA error code /** Convert an mbed TLS error code to a PSA error code
* *